Inorganic Board and a Method for the Manufacturing Thereof

Abstract

The object of the present invention is to provide an inorganic board whose dimensional stability, anti-freezing and fusing properties, and the like are much improved. To attain this object, an inorganic board is manufactured using a method comprising: preparing a raw material slurry by the dispersing of a cementitious material, silica-containing material, woody reinforcement, and mica in water, forming a papered mat by sheet forming the raw material slurry, pressing the papered mat, and curing the pressed papered mat in an autoclave at a temperature higher than 150° C., wherein the mass ratio of the cementitious inorganic material and silica-containing material is set to be in the range of between 35:65 and 45:55, to promote the curing reaction of the inorganic board and improve its dimensional stability and anti-freezing and fusing properties.

Description

FIELD OF THE INVENTION [0001] The present invention relates to an inorganic board containing mica, and a method for the manufacturing thereof. BACKGROUND OF THE INVENTION [0002] Hitherto, asbestos has been used as a reinforcement in inorganic board, but the environmental pollution caused by the scattering of fine asbestos powder has become a serious problem, so that at present, woody reinforcements such as wood flake, wood fiber and the like are being used instead of asbestos. Nevertheless, there is a problem in that inorganic board using such materials for woody reinforcement has poor dimensional stability, so that when said inorganic board absorbs or discharges moisture, said inorganic board elongates or contracts, resulting in the warping, and further, cracking of said inorganic board. [0003] To solve said problem, an idea wherein mica is added to the mixture of woody reinforcements and cement is proposed. Mica has a high elasticity, so that dimensional stability, cutting workabi...

AI Technical Summary

Benefits of technology

[0014] In the present invention, since the mass ratio of said cementitious inorganic material and said silica-containing material is set to be in the range of between 35:65 and 45:55 to promote the curing reaction of said inorganic board, even when the content of mica in the raw material mixture is reduced to easily mix raw materials uniformly, the dimensional stability of the resulting inorganic board is much improved, and further anti-freezing and fusing properties of said inorganic board is also improved.

[0015] The present invention is described in detail.

[0016] woody reinforcement used in the present invention is such as a wood flour, wood wool, wood flake, wood fiber, woody pulp, wood fiber bundle, strand, pulp made from conifer, broadleaf tree, recycled paper and the like, and two or more kinds of said woody reinforcement may be mixed together, and further, a material contai

Problems solved by technology

Hitherto, asbestos has been used as a reinforcement in inorganic board, but the environmental pollution caused by the scattering of fine asbestos powder has become a serious problem, so that at present, woody reinforcements such as wood flake, wood fiber and the like are being used instead of asbestos.

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